Improvement in sun-dials



UNITE STATES PATENT QFFIGE.

AXEL w. ANDERSON, OFBEDFORD, PENNSYLVANIA, ASSIGNOR TO HIMSEL AND ILLIAM B. HECKERMAN, 0F SAME PLACE.

IMPROVEMENT IN SUN-DIALS.

Specification forming part of Letters Patent 0. 196,550, dated October 30, 1877 application filed September 1, 1877.

'TO all whom it may concern:

' sponding parts.

My invention consists of a ring having circumferen'tial slots, surroundedby a perforated adjustable band, and containing an adjustable dial or scale, formed in an epicycloid curve, and having engraved on it hour-marks, upon which a pencil of light falls through the aperture in the band.

Referring to the drawings, A is a hoop or ring, having circumferential slots at b, and provided with an eye, 0, and ring 61, by which it may be suspended. A narrow thin band, B, surrounds the ring A, and is provided with guiderpins e, which extend inward into the slot a. A small aperture, f, is made through the band, and along the surface of the ring, at the sides of the band B, letters are engraved,

which represent the months of the year. A

scale or dial, 0, formed on an epicycloid curve, and having marked on it figures representing the hours of the day, is secured to the ring increased steadiness.

The manner of using my improved sun-dial is as follows: The aperture f in the band B is placed opposite the letter indicating the appropriate month. This gives the required declination for the month. The instrument is then suspended by the ring 01, and placed so thata pencil of light passes through the aperture f and falls on the dial 0. The figure touched by the pencil indicates the hour. If great accuracy is required, the spaces between the figures may be graduated.

' The instrument is not limited to any particular size, as it may be made so small as to serve as a charm for a watch-chain, or it may be made of large size and mounted on a fixed support.

Having thus described my invention, What I claim as new, and desire to secure by Letters Patent, is

The dial 0, formed on an epicycloid curve, as described, in combination with ring A and band B, as specified.

AXEL WILLIAM ANDERSON.

Witnesses ALEX. RAMsEY, GEo. BLYMYER. 

